Circuit testing apparatus



9 E. L. CLEMENS CIRCUIT TESTING APPARATUS 2 Sheets-Sheet 1 Filed Deb. 20, 1944 Earl. Lclemens and W .1/ i 1' W H Attorneys I Jan. 4, 1949. L, E N 2,457,869

, CIRCUIT TESTING APPARATUS 7 Filed Dec. 20, 1944 Z Shee tS-Sheet 2' In ventm' Ear-L LCLemens Patented Jan. 4, 1 949 H 2,457,869

, w ee; l

' ash ."'c1emehs;is s "in ii iefh;,'ssjs ghdr er one-f half to 'gillernens, Saginaw, Mich.

pplication December 20, 1 94 4, Serial $0,569,023;

1 Claim. (dig talis This invention relates t rcuit testers for 2 which issurrounded the dpwm flenge testing or examining the;, wiring.-of electrical aplll and it is, therefore, arranged fiush,withthe paratus for continuity or for grounding, for topwallof the lidsection 2. The upturned flange identifying individual conductor in cables and I is provided with screw threads and a cap l4 installations including a plurality of conductors 5 made of transparent plastic such as Lucite or of and for like purposes. glass forming a lens is screwed over it.

Its main object is to provide a simple compact The buzzer 6 is mounted on a sheet metal base and eflicient testing apparatus of very small size I6 spot welded to the top wall of the lid, and it and weight which may be used even where condiconsists, as usual, of a couple of coils I! provided tions are such that on account of noise a buzzer 10 with magnetic cores, amovable contact 18 mountindication is unreliable. ed on a. spring and a fixed contact I9 whose posi- The invention is described in the following tion is adjustable. A tray-like cover 20 may be specification and is illustrated in the accompanyfixed over the buzzer 6 in order to prevent access ing drawings by way of example, it being underof dust or of other particles to the contacts. stood that the modification of the invention A ball 2| for carrying the box may be fixed shown is illustrative and that further modificato the top wall of the lid 2.

tions in this case may be easily constructed by The lower container section I merely houses the experts skilled in the art by following the the dry cells 5 serving as a battery; in the modigeneral idea laid down in the specification defication shown two dry cells are used connected scribing the modification shown. by a connector 26. The container in this case is In the accompanying drawings: so shaped as to be able to accommodate just Figure 1 is a top view of the testing apparatus these two cells. It, therefore, consists of two showing the container or box when opened. semi-circular sections closely surrounding the dry Figure 2 is an elevational and partly sectional cells which are of circular cross section, with a view of the lid or cover. short straight section between them. The ap- Figure 3 is a view of the circuit tester box when paratus may, therefore, be of a very small size, in a closed condition. and may easily be carried either in the pocket Figure 4 is a diagram of the circuit connection or in the case in which the electrician carries his of the tester. outfit.

The instrument consists of a box with a lower The container l moreover is rovided with a container section I to which an upper lid or cover o 2 thr u which t e t wi 2 p to the 2 is hinged. This lid section has the shape of it outside and with a wire holder 24 consisting of tray and is provided with side walls 4; it thus a metal strip who e end 13014110115 23 have been forms a container housing all the components bent outwardly. It i l P0111011 y be fixed used with the exception of the dry cells 5 which to the container while the bent portions serve are accommodated in the lower container section as a base around which the test wires 22 may b I. The hinges 3 are arranged at the lower end of wound so as not to become entangled. The test the side walls 4 so that when the lid is turned wir 22 m y be p v w te t p u 5 as around the hinges all the components housed in usual. the 11 and in the container are exposed and are The conn ct w inserted between the access1ble. tery 5 and the lamp 1 and the test wires 22 lead- The lid section 2 houses a. buzzer 6 and a lamp ing to the lamp 1 are flexible and are of such 1, consisting of alight bulb which is arranged in length that they will readily permit the opening a s llow dep e s on 8 of the lid his denresof the cover or lid. When the latter is opened $1011 15 Provided Wlth a p g or hole 9 surall parts are therefore visible and accessible so lm th n upturned fl n e l"- Belcw the that defective connections or other defects may said depression 8 the lamp base I I is fixed on be easily detected.

small pieces of sheet metal l5 spot welded to the As will be easily understood by referring to sides of lid section 2 on said base the bulb of the Figure 5, the continuity of a wire which also lamp I is mounted in the usual manner, the conserves to establish its identity in the event of nections being established by means of the bindan arrangement showing a multiplicity of wires ing posts l'2, I3. or the grounding of a wire may be tested by ap- The light bulb 1 projects through the opening 9 plying the plugs 25 of the test wires 22. The light in the depression 8 of the top wall of the lid secbulb I will be lighted and the buzzer 6 will be operated with full battery voltage if the wire is a continuous one.

What I claim is:

A circuit testing arrangement comprising a container, consisting of two hinged hollow sections, the lower section being provided with a hole and adapted to house the cells of a dry cell battery, the upper hollow lid section carrying the testing equipment on its-top wall, said-equipment mcmdmgabu'zzer, a buzzer support piate for titesame and a shield covering said buzer and further including a lamp socket mounted adjacent to saiiiv buzzer support, said top wall beingprovidedfiwith a hole near the lamp socket for accommodatingga signal lamp, mounted on the lamp seams transparent dome shaped cover over said 'holerccnnect ing posts on said buzzer and "lamp-socket, testing cables passing through the hole in the lower container section to the outside, one of said cable's being connected with the battery and the other with one (if the aforesaid'eonneeung posts, an?! flexible cables adaptedqto be accommodated within the space encio's'eumy the-upper N'umber section, said cables establishing a flexible connection between the battery, and one of the connecting posts and a parallel connection between said buzzer and said signal lamp.

EARL L. CLEMENS.

REFERENCES CITED frhe-t'ollowinz referencesane of-record in the UNITED STATES PATENTS 

